Over an extended period of time, the same reactions that fight stress will:

A) make the body more vulnerable to other stressors.
B)gradually discontinue.
C)increase one's energy level.
D)become forms of positive stress.

I read something about choice D but I´m not sure. Is it right?

Assuming that the stress continues over that period of time, definitely it is A. See this article:

http://www.members.cox.net/dagershaw/lol/Stress1.htm

To determine the correct answer, let's break down the question and go through each option.

Option A) "Make the body more vulnerable to other stressors": This suggests that over time, the reactions that fight stress can actually weaken the body's ability to handle additional stress. This does not align with the idea that these reactions would be beneficial.

Option B) "Gradually discontinue": This implies that over time, the stress-fighting reactions would gradually stop or diminish. However, the question suggests that these reactions are consistent over an extended period, so this choice does not seem appropriate.

Option C) "Increase one's energy level": This suggests that the reactions that fight stress lead to an increase in energy. While this may be true in some cases (such as the release of adrenaline during the body's stress response), it does not necessarily cover the entire range of stress-fighting reactions.

Option D) "Become forms of positive stress": This choice implies that the reactions that fight stress transform into positive stress. However, this concept seems vague and does not provide a clear explanation of how or why stress-fighting reactions would be considered positive stress.

Based on the analysis of each option, it appears that none of the choices fully align with the given question. It is recommended to consult additional resources or clarify the question further to ensure a more accurate answer.